Read the following Assertion and Reason and choose the correct option. Assertion: Charles Darwin and Francis Darwin concluded that the tip of coleoptile was the site of transmittable influence that caused the bending of the entire coleoptile Reason: The PGR abscisic acid belongs to this group of plant growth inhibitors

Step-by-step solution

Charles Darwin and his son Francis Darwin when they observed that the coleoptiles of canary grass responded to unilateral illumination by growing towards the light source (phototropism). After a series of experiments, it was concluded that the tip of coleoptile was the site of transmittable influence that caused the bending of the entire coleoptile .